CN1182511A - Asymmetric high-speed data transmission method in mobile communication network - Google Patents
Asymmetric high-speed data transmission method in mobile communication network Download PDFInfo
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- CN1182511A CN1182511A CN96193504.9A CN96193504A CN1182511A CN 1182511 A CN1182511 A CN 1182511A CN 96193504 A CN96193504 A CN 96193504A CN 1182511 A CN1182511 A CN 1182511A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1682—Allocation of channels according to the instantaneous demands of the users, e.g. concentrated multiplexers, statistical multiplexers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
- H04B7/2659—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA] for data rate control
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Abstract
A typical feature of high-speed data transmission in a cellular radio environment is that it is strongly unidirectional. In accordance with the present invention, a connection can be adapted to this fact so that the connection is asymmetric, providing a large transmitting capacity in the direction in which the most of the data stream is passing, whereas in the opposite direction, the transmitting capacity is smaller. The transmission and reception time-slots are arranged asymmetrically so that transmission and reception do not take place simultaneously. Upon establishing a connection, the mobile station informs the network of its maximum capacity regarding reception and transmission, whereby the network calculates an appropriate time-slot configuration. First, a symmetric connection consisting of a specific number of channel pairs is allocated in the same way as in a prior art HSCSD method. Thereafter, only the required time-slots in the transmitting and receiving directions are used, still keeping the unused time-slots allocated.
Description
The present invention relates to send on based on the wireless path in the mobile communication system of time division multiple access (TDMA) method of data, several time slots of a frame can be assigned to mobile radio station and send data in this system.
The UK Patent Application GB-2 that Philips proposes discloses the method that sends data on the time division duplex channel 232, No. 562.According to the method for being advised, distribute one or more channel to send data.Each channel is made of a pair of time slot.Be or when will be asymmetric, discharge the time slot of not using on other direction when detecting transfer of data, thereby and these time slots can be reallocated and be used in other place.
A tdma frame length is 4.615ms in gsm system (mobile communication is organized especially), and is made of eight time slots from zero to seven numberings.The number of time slot is identified by abbreviation TN (time-gap number).A full rate transmission channel TCH/F who is used for sending voice-and-data is made of the time slot with identical time-gap number in the successive frame, makes from the angle of network, can constitute eight transmission channels on a carrier wave.Arrangement from the mobile radio station to the base station direction (up link) and the transmission on the direction from the base station to the mobile radio station (down link), make that the reception in the base station is just carried out than three pulse trains that send to lag behind.Like this, in the transmit frame time slot timeslot number TN and received frame in the TN of time slot identical.Correspondingly, in mobile radio station, send than receiving three pulse periods that lag behind and just carry out.In Figure 1A-1E, will explain these incidents from the angle of mobile radio station.Figure 1A has illustrated near the continuous slot of the mobile radio station the base station.Rx represents receiving slot, and Tx represents sending time slots, and M represents the supervision to neighbor cell.Send, receive with monitoring and take place with different frequencies.Figure 1B has illustrated the time slot of the receive frequency of mobile radio station, and Fig. 1 C has illustrated the time slot of the transmission frequency of mobile radio station.Transmission and receiving slot are identified by oblique line.In time between sending and receiving, the bcch carrier of mobile station monitors neighbor cell.Fig. 1 D has illustrated the time slot of the bcch carrier of a neighbor cell, and Fig. 1 E has illustrated the time slot of the bcch carrier of second neighbor cell.Connect among the figure time slot arrow diagramming the radio parts of mobile radio station receiving, send and monitor between the frequency shift that must carry out.
Be sent in the sending time slots with pulse train form and carry out.A calibration pulse string comprises two modulation 58 bit sequences, and 26 training sequences are arranged between two sequences.Beginning and end at pulse train have three to trail the position.Not overlapping for the pulse train that makes continuous reception, in the end of each pulse train a guard time is arranged.The physical length of guard time depends on the envelope that sends pulse, but common guard time length is on the grade of 30 microseconds.When the mobile radio station that sends with identical wireless carrier is within the random distance of base station, and when the propagation time of the radio wave from the base station to the mobile radio station, the unoccupied place changed one by one the time, just need this guard time.Thereby, the reception period in the base station, the pulse train that sends in the adjacent time-slots overlapping, the length of the pulse train that sends in time slot must be shorter than time slot.In order to make the as far as possible short and mobile radio station of guard time still can be away from the base station, must compensation away from the propagation delay of the transmission of the mobile radio station of base station.Thereby schedule system makes the base station dynamically adjust the transmitting time of these mobile radio stations according to the pulse train that receives from each mobile radio station.The base station provides so-called timing advance TA for mobile radio station, adjusts the zero hour of its transmission according to this lead mobile radio station.Like this, in the mobile radio station away from the base station, the time between receiving and sending is considerably shorter than the mobile radio station of neighbor base station.
According to foregoing and Figure 1B-1C, thereby gsm system is optimized the time slot of a corresponding time slot of a pair of time slot that comprises continuous descending chain circuit frame and continuous uplink frame as a transmission channel.Like this, can only use a simple radio parts in mobile radio station, this radio parts synthesizes different being used for and receives, and sends and monitor the frequency of neighbor cell.In order to make frequency synthesizer have time enough tuning and be set on the new frequency finishing required frequency shift, to receive one and postpone to carry out the transmission of mobile radio station just determine to lag behind in the above described manner.Correspondingly, between sending and receiving, still keep time enough so that the frequency of monitoring neighbor cells.
The defective of the transmission channel scheme of above-mentioned prior art is only to use a transmission channel time slot in each frame only to allow a very little capacity, and for example the maximum data transfer rate in transmission channel is 9.6 kbps in gsm system.In recent years, under promotion, obvious improvement has been arranged to the demand of mobile radio communication high speed data, services.For example, in order to use ISDN (integrated services digital network) circuit switching digital data service, need be at least the transmission rate of 64 kbps.The data, services such as modulator-demodulator and G3 class facsimile terminal of public switch telephone network PSTN needs higher transmission rate, as 14.4 kbps.An expansion field of the mobile data transmission of message transmission rate that need be higher than 9.6 kbps is the mobile video service.Minimum data transmission rate in the video transmission can be 16 or 31 kbps.
But the transmission rate of current mobile radio communication is not enough to satisfy these new demands.
In order to increase message transmission rate, along with the development of being carried out at ETSI (European Telecommunication Standard center) has worked out the whole bag of tricks.These methods are commonly referred to as HSCSD (high speed circuit switched data) here.Various suggestions have been proposed, as changing frame structure.But because demand is changed at existing gsm system, above-mentioned suggestion is a kind of method of complexity.The method of the increase message transmission rate of another suggestion is to use more than a pair of channel, and promptly mobile radio station uses the several tdma slots in each frame.High-speed data signal is assigned in the above-mentioned parallel channel so that send by wireless path at transmitting terminal, and this signal is mixed once more at receiving terminal.Like this, according to the quantity of the transmission channel that distributes, can provide to have the octuple of reaching in the message transmission rate of standard data delivery speed.This is known as the multi-slot access technique.It is characterized in that all having the available time slot of equal number at sending direction and receive direction, promptly be symmetry and in two transmission directions, provide identical transmission capacity.Similar aspect this with being connected of fixed network, fixed network be connected on the both direction symmetry normally.
But be to use the symmetrical HSCSD method of several time slots that some defectives are arranged.Because such problem that scheme caused has only a time slot between being to receive and sending, and promptly has only one section 557 time about microsecond, uses two continuous slots, be actually as the scheme of time slot 2 and 3 and be difficult to realization.When considering that sending required Timing Advance has shortened situation during this period of time, required actual minimum time has only about 340 microseconds between sending and receiving, and has wherein considered the maximum summation of employed propagation delay.It for this finishes the frequency hopping of 45-MHz for synthesizer and drops on the new frequency a very harsh time.But in No. 2082, the patent application FI-294 that uses the applicant to submit on December 15th, 1994, be possible (this application is not disclosed in the day of the application's submission) under the situation of the method for suggestion.If upwards use time slot 3 and 4 at downlink side, and on uplink direction, use time slot 4 and 5, then can be reduced to two time slots in the transmission of mobile radio station and the time between the reception, the radio parts of mobile radio station can be finished two main frequency hoppings therebetween: from the quick saltus step that sends to supervision with from monitoring the saltus step of reception.This is difficult to realize very much.In addition, the difference between the time slot is not observed Current Standard, and this situation can have problems in network when the transmission for other distributes time slot.
If three pairs or how right channel are arranged, then one group of radio parts no longer is enough for a mobile radio station.Three pairs of channels are being arranged, and under the situation as time slot 2,3 and 4, the transmission meeting begins after receiving immediately, and considers the Timing Advance that transmission is required, and sending in fact can beginning before receiving end.If three or more time slots is arranged, then mobile radio station gets and sends simultaneously and receive, and nature can need two groups of radio parts like this.And, when time slot quantity surpasses four, will have no time to come monitoring neighbor cells with one group of radio parts, can cause a kind of situation like this, promptly during sending, data can not have available information about neighbor cell.Need this information when switching.
Target of the present invention is a kind of high-speed data transmission method that does not have the defective of prior art HSCSD method.
A target of the present invention is to realize a kind of simple structure, this structure only needs existing network is carried out very little change and allows to use structure than the simpler mobile radio station of mobile radio station that can carry out symmetrical HSCSD transmission, in this case, can need the synthesizer of lesser amt and only need a radio parts.
Another target is a channel approach, compares with existing scheme, and this scheme can be saved the transmission capacity of the standing part of the transport channel capacities of wireless path and network.
Another target is to reduce the interference that is produced by transfer of data in base station and the mobile radio station.
Another target is a method, this method make especially mobile radio station transmitter load as best one can less and consume less energy.
Use can realize above-mentioned target based on method of the present invention, and the feature of this method is a desired content in the claim 1.
The present invention based on thinking be, the high speed data transfer in the Cellular Networks environment may be complete unidirectional, promptly data flow is mainly carried out in one direction, and during connecting, does not need to send in the opposite direction data.In fact, the needs that receive data may be stronger than the needs that send data, and the result upwards needs bigger capacity at downlink side.According to the present invention, connection can adapt to this situation, makes that it is asymmetric connecting, and big transmission capacity is provided on the direction that main data flow is passed through, and the capacity that then sends in the opposite direction is less.Asymmetricly arranging transmission and receiving slot to make does not have or has only a spot of transmission and reception to carry out simultaneously, compares with situation about can not arrange preferably, and a simpler radio parts is just enough in mobile radio station in this case.
During high-speed data connected foundation, mobile radio station transmitted the demand of its relevant data transmission rate to network.These demands can comprise following parameters: the heap(ed) capacity that receives and send, the grade of service of expectation and the grade of service that needs.What time slots heap(ed) capacity indication mobile radio station can handle at most on both transmit and receive direction.The grade of service of expectation determines that mobile radio station wishes the message transmission rate kbps of using in related connection.The expected data transmission rate is the maximum data transfer rate that allows mobile radio station to use in this connection.Can call out selection by this parameter mobile subscriber is the most feasible data transport service with regard to speed and expense for each.The grade of service that needs is determined to provide to guarantee the successional minimum-rate of transfer of data.When the indication capacity, also can adopt the suggestion that proposes in the art, be divided grade according to this suggestion mobile radio station, how many sending time slots make can use determine the first estate according to mobile radio station, can use how many receiving slots to determine second grade according to mobile radio station, and determine the tertiary gradient according to the maximum of the summation of the sending time slots of mobile radio station and receiving slot.
Above-mentioned parameter allows mobile radio communication according to the demand that is in the network under the restriction that parameter sets and message transmission rate that traffic load changes single mobile station and the user is not brought any inconvenience.Especially ought switch under the situation that stylish sub-district can not provide the desired data transmission rate, network can reduce message transmission rate.
According to these parameters, network calculations goes out suitable time slot configuration.Network can not provide one to connect fast as mobile radio station is wished in this particular moment.In this case, accept a slower connection, but when during connecting, discharging transfer resource, can change speed.
The method according to this invention at first distributes a right symmetry of channel with specific quantity to be connected in the mode identical with the HSCSD method of prior art.Afterwards, mobile radio station is by only using the transmission that needs to set up asymmetric a connection with receiving slot in this moment.But the time slot that is not used is not released, and distributes but keep during whole transfer of data, although will send pulse train in these time slots.
If an asymmetric connection is one and uses the high-speed data of a large amount of time slots to connect that the mobile radio station that then has simple radio parts can not enough be finished the needed supervision to adjacent channel of enough GSM technical specifications apace on the main direction of transmission.In this case, mobile radio station can be given network its advisory that reduces the measurement activity.The frequency that network also can arrive according to the content and/or the measurement report of the measurement report that is received descends and draws the conclusion that the measurement activity has reduced.In both cases, network can be considered the measuring capacity of minimizing when preparing to switch.
Below, by an optimum embodiment the present invention is described in more detail with reference to the accompanying drawings, wherein
Figure 1A-1E has illustrated the use to the time slot of mobile radio station,
Fig. 2 has illustrated the asymmetric transmission when using the 2+1 structure,
Fig. 3 has illustrated the asymmetric transmission when using the 3+1 structure,
Fig. 4 has illustrated the asymmetric transmission when using the 4+1 structure, and wherein surveillance operation has been reduced,
Fig. 5 and 6 begins to set up the process of asymmetric transmission from the symmetry transmission, and
Fig. 7 and 8 has illustrated different control channel selections.
Must be noted that asymmetrical situation shown in the drawings just for example, can not be limited to the situation shown in the figure to asymmetrical degree and direction.
Fig. 2 illustrates a kind of situation of asymmetric data transmission, and one of them mobile radio station just receives in two time slots and sends in a time slot.Similar with follow-up legend, the time slot above illustrates the time slot of the received frame of mobile radio station in the figure, the time slot of following time slot diagram transmit frame.The time slot of received frame is the time slot of the down link direction of serving BS.For convenience, suppose the mobile radio station neighbor base station, and do not mark Timing Advance in the drawings.But do not consider that the Timing Advance among the figure can't be to realizing that the present invention produces any influence.When discussing down link and uplink time slot, use the expression of m+n when following in the case of necessary, wherein m represents the time slot that downlink side makes progress, and n correspondingly represents uplink time slot.For example when discussing a mobile radio station, 4+2 is illustrated in and receives in four time slots and send in two time slots.
In example shown in Figure 2, the base station just sends in time slot 0 and 1, and mobile radio station just sends in time slot 0.The front has been mentioned the transmission of arranging mobile radio station and has been lagged behind and receive three burst periods and just carry out, and the time slot that wherein has identical time-gap number constitutes a transmission channel.Under situation shown in Figure 2, first receiving slot 0 and sending time slots 0 constitute a pair of, but do not have corresponding sending time slots 1 corresponding with receiving slot.As a result, mobile radio station can receive data from network with double speed in prior art transmission channel speed, and this channel comprises a time slot, but owing to has only a time slot, the time that exists mobile radio station that adjacent base station is monitored between the frame transmission period.This is identified by M.This asymmetric use to time slot allows to use to have a group of received high-speed data and safeguards the conventional mobile phone of ambulant radio parts completely, obtains enough measurement data from adjacent base station simultaneously.
Described structure of time slot also can be used in the antisymmetric mode naturally, and promptly mobile radio station sends data and only receives data in a time slot in two time slots.
Fig. 3 has illustrated a kind of asymmetrical situation, and wherein mobile radio station receives in three time slots and sends in a time slot.In the drawings, receiving slot is 0,1 and 2, and sending time slots is 1.If sending time slots is the corresponding time slot of first receiving slot, then this time slot should be time slot 0.For Timing Advance, beginning before the symmetry transmission can finish in the reception of time slot 2, this needs second group of radio parts to produce frequency.For avoiding this situation occurring, make that sending time slots is 1, in this case frequency synthesizer have almost a time slots come be tuned on the transmission frequency.After sending, still have corresponding to three time slots to come adjacent base station is carried out frequency monitoring.Under the asymmetric case shown in the figure, mobile radio station can receive data from network with the speed that is three times in the prior art transmission channel, this channel comprises a time slot, but owing to have only a sending time slots, and this time slot is corresponding to the receiving slot of centre, so this mobile radio station has time enough that adjacent channel is carried out required supervision between the frame transmission period.This is identified by M.This asymmetric use to time slot allows to use the conventional mobile phone that has a group of received high-speed data and safeguard complete ambulant radio parts.
Structure of time slot 3+1 shown in Fig. 3 also can be used in the antisymmetric mode naturally, and promptly mobile radio station can send data and only receive data in a time slot in three time slots.
If adjacent channel monitoring between each frame transmission period, then the degree of asymmetry increase can be not many than degree shown in Figure 3, promptly wish to guarantee the complete mobility of mobile radio station yet.If reduced surveillance operation, then can further increase asymmetry, but still safeguard the current mobile station apparatus that includes only a transducer.If omitted supervision fully, then can use nearly five time slots, wherein have only not remaining when supervision the under the situation of one group of radio parts at mobile radio station.In this case, can be only just safeguard high speed data transfer under the situation in mobile radio station rests on the overlay area of its Serving cell, wherein the field intensity of received signal is sufficiently high.When near the borderline region of sub-district, field intensity dies down, and connects and can interrupt, and lacks simultaneously and switches required measurement result.The nearest measurement result that network has is the result who is in mobile radio station report before setting up the data connection of idle condition, and network is not understood wireless environment when needs switch.Suppose during the idle frame of multiframe and measure, then can use five time slots and maximum data transfer rate.
As everyone knows, on the full rate transmission channel in gsm system, the multiframe of one 26 frame comprises 24 transmission channel frame (TCH frame), and a slow control channel frame (SACCH frame) and an idle frame wherein send a measurement report at SACCH mobile radio station image duration.When a time slot of SACCH frame only was used to send measurement report, every 480ms upgraded once report in current gsm system, and promptly per second is twice.The GSM technical specification also allows to carry out control survey during idle frame.If then only measure, promptly during the multiframe of a 120-ms, only carry out once, then can measure the bcch carrier of one or more adjacent base stations.
The carrier wave of measuring the sufficient amount of adjacent base station needs a lot of time, and the speed of consequently upgrading the result is slower than normal situation.This also means the mobility that has reduced mobile radio station.According to the present invention, also can measure image duration at a SACCH, according to second embodiment, this frame is assigned with but is not used.Compare with the scheme of only during an idle frame, measuring, situation is improved.
According to Fig. 4, four time slots, promptly time slot 0-3 is used to receive data, and has only a time slot, and promptly time slot 2 is used to send.Time slot 2 is corresponding time slots of the last receiving slot except that.Asymmetrical like this mode is 4+1.Between sending and receiving, have only two time slots, thereby the mobile phone that only has independent one group of radio parts has no time control survey, but during idle frame, can measure.Can give network its advisory that reduces the measurement activity by the indicating device mobile radio station of setting a suitable indication measurement report.Network also can descend according to the quantity of the interior perhaps measurement report of measurement report and draw the conclusion that the measurement activity has reduced.
Correspondingly, time slot 0-4 can be used to receive, and time slot 3 is used for sending, and asymmetric mode is 5+1 in this case.When monitoring that quantity reduces, still can use a mobile radio station that simply has only one group of radio parts.
Top description discloses the principle of symmetric data transmission.People do not notice how to constitute employed time slot.At least can constitute time slot by dual mode.Mobile radio station informing network those activities recently when connecting beginning are the activities of itself, and situation of wishing on both transmit and receive direction and demand.For desired situation, mobile radio station can provide parameter " grade of service of expectation " and " grade of service that needs ".The grade of service of expectation determines that mobile radio station wishes the message transmission rate kbps of using in this concrete connection.The grade of service that needs is determined to provide to guarantee the minimum speed of continuous data transmission.In addition, mobile radio station can provide relevant its to reduce the information of measuring capacity to network, supposes that the desired service grade does not allow to carry out the control survey based on the GSM technical specification.If what resemble in the art suggestion is divided into different grades to them according to the capacity of mobile radio station, then in the message that mobile radio station sends, capability notification is arrived network, this message comprises a level indicator.
When considering the capacity of its current capacity and mobile radio station, network calculations goes out on both transmit and receive direction can distribute for what symmetric channels.Afterwards, network provides a kind of concrete asymmetric time slot configuration, gives mobile radio station this configuration report, carries out transfer of data then.During connecting, can change time slot configuration in case of necessity.
Application program such as the equipment that links to each other with mobile radio station of PC can provide the relevant required up link and the information of downlink time slots or message transmission rate for mobile radio station automatically.These information can be contained in the Call-Set-Up message.Network can be notified mobile radio station distributed time slot in an Assignment-Command message.This message can comprise the different descriptions about up link and downlink channel.Correspondingly, a Handover-Command message that sends when switching can provide up link and downlink channel respectively.
According to the embodiment shown in Fig. 5 and 6, used the symmetrical HSCSD method of a prior art.According to this method, at first the symmetric channel of the quantity that calculates of distribution network is right, Fig. 5 (being that channel is to 1,2 and 3 in this example).Mobile radio station needn't or can not use the time slot more than on sending direction.So only stay time slot 1 and 3 not with and only in time slot 2, send data.Network need not known the activity of mobile radio station, and as never not receiving data with time slot 1 and 3, this network can not reacted by any way, but will suppose without any the content that will send.In this case, activity is similar to the situation (discontinuous transmission) of the DTX of prior art.Shown in the explanation of Fig. 4, if distributed four or five pairs of channels, mobile radio station can keep the time slot of not using of desired amt in the opposite direction, and monitors with the frequency that does not reduce.If phone has the valid wireless parts, then can monitor naturally simultaneously in transmission or reception data.
Network at first distributes the channel of symmetry right, and mobile phone and network can be held consultation to the required asymmetric transmission of mobile phone afterwards, and network then can be provided with suitable time slot.
Mainly send measurement result on the SACCH channel relevant with transfer of data, the same channel that promptly is used to send data also is used to send measurement result.Network has provided an order, is expected at according to this order network and receives measurement result in the time slot.One or more SACCH channel can be arranged.Also can indicate the time slot that is used to send data.Mobile radio station can use a time slot only to send measurement result when having distributed two or more time slot symmetrically.For example receive high-speed data mobile standing in receiving slot 1,2 and 3 under the situation of Fig. 6.Never use time slot 1 on sending direction, this mobile radio station sends data in time slot 2, sends measurement result in the SACCH channel relevant with time slot 2.The symmetrical time slot that mobile radio station also can use all to distribute to it sends, and unique one or some time slots enough are used for receiving the i.e. transmission of base station.In this case, network can tell mobile radio station to send used time slot.
In fact be one of an a pair of time slot allocation control channel SACCH and a specific fast control channel FACCH who is connected at a slow speed in following of the situation of all asymmetric data transmission.As everyone knows, the FACCH channel is made of transmission channel, thereby " lending " some transmission channel time slots send control information to mobile radio station.Thereby, in the current GSM system, on sending direction and receive direction, must have a time slot at least with identical time-gap number.But it is the corresponding time slot of first time slot on the rightabout that first time slot on the less direction of time slot there is no need.Like this, for example in Fig. 4, the corresponding time slot of sending time slots 2 is the 3rd receiving slot.
In order to send control information, can arrange control channel in several ways.If upwards than more available time slot is arranged on uplink direction, all downlink time slots can be used to send control information at downlink side, wherein only on such as a time slot, sending control information on the uplink direction.Under these circumstances, it is right that a uplink time slot and several downlink time slots constitute control channel.By Fig. 7 and 8 this thinking has been described.
In Fig. 7, time slot 1,2,3 and 4 is upwards available at downlink side, and it is available on uplink direction to indicate the time slot of character a and b.In all downlink time slots, send control information, but on uplink direction, only in time slot a, send the control information that relates to downlink time slots 1 and 2, and correspondingly, only in time slot b, send the control information that relates to downlink time slots 3 and 4.Like this, first group of transmission channel to by time slot (1, a) and (2, a) constitute, and second group of transmission channel to by time slot (3, b) and (4, b) constitute.
In Fig. 8, in the time slot 1,2 and 3 of down link direction, send control information, but on uplink direction, only in time slot a, send all control informations.The three pairs of control channels respectively by time slot to (1, a), (2, a) and (3, a) constitute.
Because data flow flows to mobile radio station as a rule, disclosed high speed data transfer allows to save the battery of mobile radio station, and its transmission demand is just very a spot of, just opens the transmitter of high power consumption once in a while.Under the situation of second embodiment, the problem that occurs is that the time slot reservation of partly distributing to mobile radio station is not used, according to asymmetrical direction, this embodiment provides the advantage that has reduced the interference of same frequency channel at another mobile radio station or in the base station but on the other hand.
Above-mentioned description is in order to explain the present invention with relevant legend.Those skilled in the art obviously can carry out different changes and improvements to the present invention under the prerequisite that does not depart from the scope and spirit of the present invention that propose in the appended claims.
Claims (17)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI951971 | 1995-04-25 | ||
| FI951971A FI101114B (en) | 1995-04-25 | 1995-04-25 | Asymmetric high speed data transfer procedure in mobile phone networks |
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| CN1182511A true CN1182511A (en) | 1998-05-20 |
| CN1079617C CN1079617C (en) | 2002-02-20 |
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| CN96193504A Expired - Lifetime CN1079617C (en) | 1995-04-25 | 1996-04-24 | Asymmetric high-speed data transmission method in mobile communication network |
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| US (1) | US6240076B1 (en) |
| EP (1) | EP0823157B1 (en) |
| JP (1) | JPH11504177A (en) |
| CN (1) | CN1079617C (en) |
| AT (1) | ATE287157T1 (en) |
| AU (1) | AU709150B2 (en) |
| CA (1) | CA2219323C (en) |
| DE (1) | DE69634170T2 (en) |
| ES (1) | ES2235184T3 (en) |
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| FI106665B (en) | 1997-11-05 | 2001-03-15 | Nokia Mobile Phones Ltd | Method and apparatus for determining the transmission power of a mobile station |
| US6587444B1 (en) * | 1997-11-14 | 2003-07-01 | Ericsson Inc. | Fixed frequency-time division duplex in radio communications systems |
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- 1996-04-24 US US08/945,387 patent/US6240076B1/en not_active Expired - Lifetime
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- 1996-04-24 CA CA002219323A patent/CA2219323C/en not_active Expired - Lifetime
- 1996-04-24 EP EP96910991A patent/EP0823157B1/en not_active Expired - Lifetime
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| JPH11504177A (en) | 1999-04-06 |
| EP0823157A1 (en) | 1998-02-11 |
| WO1996034468A1 (en) | 1996-10-31 |
| FI101114B (en) | 1998-04-15 |
| FI951971A0 (en) | 1995-04-25 |
| DE69634170T2 (en) | 2006-01-05 |
| AU709150B2 (en) | 1999-08-19 |
| DE69634170D1 (en) | 2005-02-17 |
| AU5401696A (en) | 1996-11-18 |
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| CA2219323A1 (en) | 1996-10-31 |
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